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Date: Wed, 13 Jul 2005 19:53:57 GMT
From: Christian Wittenhorst <wiwi@progon.net>
To: freebsd-gnats-submit@FreeBSD.org
Subject: SMP: em/bge drivers: severe performance loss
X-Send-Pr-Version: www-2.3

>Number:         83406
>Category:       kern
>Synopsis:       [smp] em/bge drivers: severe performance loss under SMP
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    remko
>State:          closed
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Jul 13 20:00:36 GMT 2005
>Closed-Date:    Sat Jan 27 18:49:44 GMT 2007
>Last-Modified:  Sat Jan 27 18:49:44 GMT 2007
>Originator:     Christian Wittenhorst
>Release:        5.4-RELEASE-p4
>Organization:
progon network engineering
>Environment:
FreeBSD silver.kanti-zug.ch.internal 5.4-RELEASE-p4 FreeBSD 5.4-RELEASE-p4 #1: Wed Jul 13 19:15:08 UTC 2005     root@silver.kanti-zug.ch.internal:/usr/src/sys/i386/compile/silver  i386
>Description:
On a dual Intel Xeon server (ASUS NCL-DS motherboard) the network performance drops dramatically when SMP is enabled. Figures are: FTP 20MBps->3MBps, Samba 25MBps->2MBps, NFS 27MBps->1.7MBps. This affects at least em and bge drivers. No errors in any log. Disk performance is not affected!
>How-To-Repeat:

>Fix:
sysctl machdep.cpu_idle_hlt=0 
   restores the original performance 
>Release-Note:
>Audit-Trail:

From: Christian Wittenhorst <wiwi@progon.net>
To: bug-followup@FreeBSD.org
Cc:  
Subject: Re: kern/83406: SMP: em/bge drivers: severe performance loss
Date: Wed, 13 Jul 2005 22:46:52 +0200

 sysctl machdep.hyperthreading_allowed=1
 	works as well!

From: Christian Wittenhorst <wiwi@progon.net>
To: freebsd-bugs@FreeBSD.org
Cc:  
Subject: Re: kern/83406: SMP: em/bge drivers: severe performance loss
Date: Wed, 13 Jul 2005 20:50:24 GMT

 The following reply was made to PR kern/83406; it has been noted by GNATS.
 
 From: Christian Wittenhorst <wiwi@progon.net>
 To: bug-followup@FreeBSD.org
 Cc:  
 Subject: Re: kern/83406: SMP: em/bge drivers: severe performance loss
 Date: Wed, 13 Jul 2005 22:46:52 +0200
 
  sysctl machdep.hyperthreading_allowed=1
  	works as well!
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State-Changed-From-To: open->feedback 
State-Changed-By: remko 
State-Changed-When: Mon Dec 25 13:05:57 UTC 2006 
State-Changed-Why:  
hello, the em driver recently underwent some changes, can you tell me 
whether that improved the situation for you? 


Responsible-Changed-From-To: freebsd-bugs->remko 
Responsible-Changed-By: remko 
Responsible-Changed-When: Mon Dec 25 13:05:57 UTC 2006 
Responsible-Changed-Why:  
grab the pr for feedback tracing. 

http://www.freebsd.org/cgi/query-pr.cgi?pr=83406 
State-Changed-From-To: feedback->closed 
State-Changed-By: remko 
State-Changed-When: Sat Jan 27 18:49:43 UTC 2007 
State-Changed-Why:  
feedback timeout 

http://www.freebsd.org/cgi/query-pr.cgi?pr=83406 
>Unformatted:
